GDDR6X memory overheating on RTX 3080, 3080 Ti, 3090, and 3090 Ti
GDDR6X memory on the upper RTX 30-series cards runs at junction temperatures that exceed standard GDDR6 by a significant margin. The reference and many AIB cooler designs used thermal pads to transfer heat from the memory chips to the heatsink on the front and to the backplate on the rear. As these pads aged and compressed, contact quality deteriorated — producing memory junction temperatures high enough to cause instability without the GPU die temperature indicating anything was wrong. Cards that artefact or crash only during demanding workloads, while idle temperatures look normal, are the classic presentation. A full thermal pad replacement — both heatsink-side and backplate — resolves a large proportion of these cases.
